How to merge .rpmnew files in Pluggable Authentication Modules (PAM)?

Question Overflow asked:

A few .rpmnew files are being created after performing an upgrade of the Fedora OS. The normal procedure for merging .rpmnew files into the original ones is to compare the differences, make the necessary changes to the configuration on the .rpmnew files, and replace the original files with the new ones. However, the files contained in /etc/pam.d are links to files with same the filename appended with -ac, example:

password-auth links to password-auth-ac and has password-auth.rpmnew as upgrade.

How do I go about merging these files?

My answer:

The code in RPM that is supposed to detect file differences fails on this edge case, where the destination has been made into a symlink. In the case of these particular files, they are generally safe to replace with the new versions that came in the new RPMs.

mv /etc/pam.d/password-auth.rpmnew /etc/pam.d/password-auth-ac

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